EN ISO 20785-1:2020

SLOVENSKI STANDARD
01-oktober-2020
Nadomešča:
SIST EN ISO 20785-1:2017
Dozimetrija za merjenje izpostavljenosti kozmičnemu sevanju v civilnem letalskem
prometu - 1. del: Konceptualna osnova za meritve (ISO 20785-1:2020)
Dosimetry for exposures to cosmic radiation in civilian aircraft - Part 1: Conceptual basis
for measurements (ISO 20785-1:2020)
Dosimetrie zu Expositionen durch kosmische Strahlung in Flugzeugen der zivilen
Luftfahrt - Teil 1: Konzeptionelle Grundlage für Messungen (ISO 20785-1:2020)
Dosimétrie pour l'exposition au rayonnement cosmique à bord d'un avion civil - Partie 1:
Fondement théorique des mesurages (ISO 20785-1:2020)
Ta slovenski standard je istoveten z: EN ISO 20785-1:2020
ICS:
13.280 Varstvo pred sevanjem Radiation protection
49.020 Letala in vesoljska vozila na Aircraft and space vehicles in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20785-1
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2020
EUROPÄISCHE NORM
ICS 13.280; 49.020 Supersedes EN ISO 20785-1:2017
English Version
Dosimetry for exposures to cosmic radiation in civilian
aircraft - Part 1: Conceptual basis for measurements (ISO
20785-1:2020)
Dosimétrie pour l'exposition au rayonnement Dosimetrie für die Belastung durch kosmische
cosmique à bord d'un avion civil - Partie 1: Fondement Strahlung in Zivilluftfahrzeugen - Teil 1:
théorique des mesurages (ISO 20785-1:2020) Konzeptionelle Grundlage für Messungen (ISO 20785-
1:2020)
This European Standard was approved by CEN on 1 July 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20785-1:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 20785-1:2020) has been prepared by Technical Committee ISO/TC 85 "Nuclear
energy, nuclear technologies, and radiological protection" in collaboration with Technical Committee
CEN/TC 430 “Nuclear energy, nuclear technologies, and radiological protection” the secretariat of
which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2021, and conflicting national standards
shall be withdrawn at the latest by February 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 20785-1:2017.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 20785-1:2020 has been approved by CEN as EN ISO 20785-1:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 20785-1
Third edition
2020-07
Dosimetry for exposures to cosmic
radiation in civilian aircraft —
Part 1:
Conceptual basis for measurements
Dosimétrie pour l'exposition au rayonnement cosmique à bord d'un
avion civil —
Partie 1: Fondement théorique des mesurages
Reference number
ISO 20785-1:2020(E)
©
ISO 2020
ISO 20785-1:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 20785-1:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General terms . 1
3.2 Quantities and units . 2
3.3 Atmospheric radiation field . 4
4 General considerations . 6
4.1 The cosmic radiation field in the atmosphere . 6
4.2 General calibration considerations for the dosimetry of cosmic radiation fields in
aircraft . 7
4.2.1 Approach . 7
4.2.2 Considerations concerning the measurement . 7
4.2.3 Considerations concerning the radiation field . 8
4.2.4 Considerations concerning calibration . 8
4.2.5 Simulated aircraft fields . 9
4.3 Conversion coefficients . 9
5 Dosimetric devices .10
5.1 Introduction .10
5.2 Active devices .10
5.2.1 Devices to determine all field components .10
5.2.2 Devices for low LET/non-neutron .11
5.2.3 Devices for high-LET/neutron component .12
5.3 Passive devices .13
5.3.1 General considerations .13
5.3.2 Etched track detectors .14
5.3.3 Fission foil detectors .14
5.3.4 Superheated emulsion neutron detectors (bubble) detectors .14
5.3.5 Thermoluminescent detectors.15
5.3.6 Photoluminescent detectors .15
Annex A (informative) Representative particle fluence rate energy distributions for
the cosmic radiation field at flight altitudes for solar minimum and maximum
conditions and for minimum and maximum vertical cut-off rigidity .16
Bibliography .22
ISO 20785-1:2020(E)
Foreword
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URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 85, Nuclear energy, nuclear technologies,
and radiological protection, Subcommittee SC 2, Radiation protection.
This third edition cancels and replaces the second edition (ISO 20785-1:2012), wh
...